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diff --git a/blockly/generators/python/logic.js b/blockly/generators/python/logic.js
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+/**
+ * @license
+ * Visual Blocks Language
+ *
+ * Copyright 2012 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Generating Python for logic blocks.
+ * @author q.neutron@gmail.com (Quynh Neutron)
+ */
+'use strict';
+
+goog.provide('Blockly.Python.logic');
+
+goog.require('Blockly.Python');
+
+
+Blockly.Python['controls_if'] = function(block) {
+  // If/elseif/else condition.
+  var n = 0;
+  var argument = Blockly.Python.valueToCode(block, 'IF' + n,
+      Blockly.Python.ORDER_NONE) || 'False';
+  var branch = Blockly.Python.statementToCode(block, 'DO' + n) ||
+      Blockly.Python.PASS;
+  var code = 'if ' + argument + ':\n' + branch;
+  for (n = 1; n <= block.elseifCount_; n++) {
+    argument = Blockly.Python.valueToCode(block, 'IF' + n,
+        Blockly.Python.ORDER_NONE) || 'False';
+    branch = Blockly.Python.statementToCode(block, 'DO' + n) ||
+        Blockly.Python.PASS;
+    code += 'elif ' + argument + ':\n' + branch;
+  }
+  if (block.elseCount_) {
+    branch = Blockly.Python.statementToCode(block, 'ELSE') ||
+        Blockly.Python.PASS;
+    code += 'else:\n' + branch;
+  }
+  return code;
+};
+
+Blockly.Python['logic_compare'] = function(block) {
+  // Comparison operator.
+  var OPERATORS = {
+    'EQ': '==',
+    'NEQ': '!=',
+    'LT': '<',
+    'LTE': '<=',
+    'GT': '>',
+    'GTE': '>='
+  };
+  var operator = OPERATORS[block.getFieldValue('OP')];
+  var order = Blockly.Python.ORDER_RELATIONAL;
+  var argument0 = Blockly.Python.valueToCode(block, 'A', order) || '0';
+  var argument1 = Blockly.Python.valueToCode(block, 'B', order) || '0';
+  var code = argument0 + ' ' + operator + ' ' + argument1;
+  return [code, order];
+};
+
+Blockly.Python['logic_operation'] = function(block) {
+  // Operations 'and', 'or'.
+  var operator = (block.getFieldValue('OP') == 'AND') ? 'and' : 'or';
+  var order = (operator == 'and') ? Blockly.Python.ORDER_LOGICAL_AND :
+      Blockly.Python.ORDER_LOGICAL_OR;
+  var argument0 = Blockly.Python.valueToCode(block, 'A', order);
+  var argument1 = Blockly.Python.valueToCode(block, 'B', order);
+  if (!argument0 && !argument1) {
+    // If there are no arguments, then the return value is false.
+    argument0 = 'False';
+    argument1 = 'False';
+  } else {
+    // Single missing arguments have no effect on the return value.
+    var defaultArgument = (operator == 'and') ? 'True' : 'False';
+    if (!argument0) {
+      argument0 = defaultArgument;
+    }
+    if (!argument1) {
+      argument1 = defaultArgument;
+    }
+  }
+  var code = argument0 + ' ' + operator + ' ' + argument1;
+  return [code, order];
+};
+
+Blockly.Python['logic_negate'] = function(block) {
+  // Negation.
+  var argument0 = Blockly.Python.valueToCode(block, 'BOOL',
+      Blockly.Python.ORDER_LOGICAL_NOT) || 'True';
+  var code = 'not ' + argument0;
+  return [code, Blockly.Python.ORDER_LOGICAL_NOT];
+};
+
+Blockly.Python['logic_boolean'] = function(block) {
+  // Boolean values true and false.
+  var code = (block.getFieldValue('BOOL') == 'TRUE') ? 'True' : 'False';
+  return [code, Blockly.Python.ORDER_ATOMIC];
+};
+
+Blockly.Python['logic_null'] = function(block) {
+  // Null data type.
+  return ['None', Blockly.Python.ORDER_ATOMIC];
+};
+
+Blockly.Python['logic_ternary'] = function(block) {
+  // Ternary operator.
+  var value_if = Blockly.Python.valueToCode(block, 'IF',
+      Blockly.Python.ORDER_CONDITIONAL) || 'False';
+  var value_then = Blockly.Python.valueToCode(block, 'THEN',
+      Blockly.Python.ORDER_CONDITIONAL) || 'None';
+  var value_else = Blockly.Python.valueToCode(block, 'ELSE',
+      Blockly.Python.ORDER_CONDITIONAL) || 'None';
+  var code = value_then + ' if ' + value_if + ' else ' + value_else;
+  return [code, Blockly.Python.ORDER_CONDITIONAL];
+};